Covered writing or drawing slate.



R. ROBERTSON. COVERED WRITING GR DRAWING SLATE.

. APPLICATION FILED IMI. 22. 1917'. l L Panfcedfxug. 28,1917.

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`l @TATRR PART llflhlm ROBERT ROBERTSON, OF DUNEDIN, NEW ZEALAND.

COVERED WRITING OR DRAWING SLATE.

Application led January 22, 1917.

To all whom t may concern:

Be it known that I, ROBERT ROBERTSON, a subject of His Majesty the King of Great Britain, residing at Elder street, in the city of Dunedin, in the British Dominion of New Zealand, have invented certain new and useful Improvements in Covered Writing or Drawing Slates, of which the following is a specification.

The objects of this invention are to preserve and protect the slate from breakage, to preserve any Writing or drawing thereon and also to provide eXtra surfaces for other purposes. For this purpose I slightly alter the profile of the usual slate frame by making a side or end thinner, and thin flush covers to slide over the slate faces, one over each face, the inner faces of these sliding covers to be surfaced and colored or faced with any preparation for such use as crayons or chalk, or have useful matter printed on one Or both faces.

Thus, in addition to Obtaining double the surfaces for use I produce a slate that is free from damage together with anything marked on same.

This invention applies to the usual school slate, or slate of any quality, to the opal or opaline tracing slate or to the papier-mch slate, or to slates formed of ground glass.

Referring to the laccompanying drawmg:-

Figure l is the elevation of a slate with one of the covers slightly drawn out and Fig. 2 is an end elevation of the same.

Fig. 3 is a side elevation of the slate showing both covers as drawn out to show the movement of same.

A A A are ordinary sides or ends of a slate with grooves for the covers in same and A1 is the thinned side or end for the covers to slide past.

Specification of Letters Patent.

Patented Aug. 28, 192W.,

Serial No. 143,814.

B is one cover and B1 the surfaced face of same. C Vis the other cover and C1 the inner surfaced face of same. D is the usual wiring that may or may not be used, the covers not interfering with this strengthening device in any way.

Although the grooves are shown as beveled, any shaped grooves may obviously be adopted.

The surfaces that slide past the surfaces of the slate, or the inner ones of the covers, BL and C1, are prepared in any well known manner for crayon work or they may have any matter printed thereon if preferred.

In this invention any suitable materials or sizes may be adopted.

I-Iaving now described my said invention, what I claim and desire to secure by Letters Batent of the United States of America, 1s:-

A slate having a surrounding frame with grooves at opposite sides opening through one end, the grooves being formed adjacent to both surfaces of the slate body, and covers engaging the two sets of grooves and slidable in the latter, the two covers having their inner surfaces which are normally adjacent to the slate surfaces prepared for crayon work and other purposes, the outer surfaces of the covers being also adapted to receive suitable matter for educational and other purposes, the covers protecting the slate proper against breakage.

In testimony whereof, I affix my signature, in presence of two witnesses.

ROBERT ROBERTSON.

Witnesses:

I-InNToN MAOAULAY DAvnY, Mann MARY DAVEY.

Copies of this patent may be obtained. for ive cents each, by addressing the Commissioner of Patents, Washington, D. C. 

